Apparatus for winding and terminating dynamo electric machine cores

ABSTRACT

An apparatus used in terminating and winding coils of a core of a dynamo electric machine. The coils being formed from at least an electric wire and the core having a longitudinal axis. The coils are wound by relatively moving a wire dispenser with respect to a core with relative motions of translation and rotation; at least a stretch of wire extends from the coil; and the stretch of wire is provided with a portion for a termination connection to a termination structure of the core, such as a tang. The method avoids waste cut wire in the apparatus. The core is provided with a groove at an end to receive at least a wire in the path of the wire for the termination of the coils. The apparatus comprises a wire deflector positioned adjacent the end of the core, where the groove is located, in order to intercept and align the wire with the groove. The apparatus can comprise a device for applying torques in two directions on a pulley wheel for feeding wire as a function of the position of the dispenser in the translation and the position of the core in the rotations.

FIELD OF THE INVENTION

The present invention relates to winding coils of dynamo electricmachines.

In particular the solutions of the invention relate to winding coils andterminating coil wires of dynamo electric machine cores.

DESCRIPTION OF THE PRIOR ART

A wire dispenser normally referred to as “needle” releases at least anelectric wire for forming a wound coil having a predetermined number ofturns. Before and after the winding operation, the termination wires ofthe coils are connected to terminal structures which are assembled onthe core. These connection operations are normally referred to as“termination” operations.

Once the terminal structures have been terminated they are connected tothe electric supply by means of plugs, or by using further wireconnections.

The termination wires are placed along predetermined trajectories to bein contact and anchored to the terminal structures. The terminalstructures can be provided with receiving seats where the terminationwires are positioned. Portions of the terminal structures forming thereceiving seats can be heated and deformed around the termination wireto form a fused joint, as described in EP419849A1. Typical terminalstructures having this type of configuration are tang terminals, asdescribed in EP419849A1.

The termination requires cutting the wire in excess that extends fromthe terminal structure. This cutting step is necessary to free the corefrom the wire of the needle once the winding has been completed; inother words, cutting the wire that extends from the terminal structureresults in waste wire, which needs to be collected in the windingapparatus and afterwards recycled.

In order to precisely position the termination wire with respect to theterminal structure, the wire dispenser is relatively moved with respectto the core to deposit the wire on a predetermined trajectory. This canrequire changing the orientation of the wire passage of the wiredispenser with respect to the orientation used during winding.

More particularly, in order to wind the coils, the passage channel wherethe wire of the dispenser runs is normally positioned perpendicular tothe longitudinal axis of the core. The longitudinal axis of the core iscommonly central and parallel to the extension of the core slots wherethe coils are placed during the winding operations.

The dispenser can be oriented by means of a rotation mechanism whichpositions the wire passage parallel to the longitudinal axis of the corewhen the termination wires need to be formed and positioned.

Winding apparatus and mechanisms for rotating the dispenser between thetwo orientations are described in EP0982837A1.

The coils wound on the core can be connected by stretches of wire whichare positioned along predetermined paths of the end structures of thecore. These connection wire stretches are formed by extracting wire fromthe dispenser when the dispenser is adjacent an end of the core. Theoperation is commonly referred to a “intermediate termination”. Normallythe ends of the core where the paths are formed is where the structureof the dispenser is not required to extend along the core.

For some winding and termination schemes the paths of the intermediatetermination need to be accomplished on an opposite end of the core; thatis on the end of the core which requires the dispenser structure toextend along the core to dispense the necessary wire amount.

The wire dispenser releases the electric wire to wind the coils byrelatively moving with respect to the poles of the core. The relativemovement of the dispenser can consist of two reciprocating translationsfor releasing the wire in the two stretches of the coils which areparallel to the axis of the core, and two combinations consisting oftranslations of the dispenser and rotations of the core for releasingthe wire in the two stretches of the coils that are near to the ends andoutside the core.

As mentioned in the foregoing, the dispenser is provided with an endpart where wire exits to reach the core. This end part consists of atubular member which guides the wire very accurately to position italong the required stretches of the wire. The end part is usuallypositioned perpendicular to the axis of the core during winding. Thewire reaches the end part by first running along a stretch which isparallel to the axis of the core, and then accomplishes a curve ofapproximately 90° to enter the end part.

The end part can have very small width because it is required to pass inextremely narrow spacing of the cores (for example inside the slots ofthe core). Consequently the passage of the wire in the dispenser can benarrow, thereby causing a certain resistance to running of the wire.

The size of the wire used to wind coils of modern motors can be of largediameter compared to the spacing where the wire is wound (for examplewith respect to the dimensions of the passage where the wire passes toenter the slots); that is the wire can have a diameter that is the orderof 1 mm and more.

The fact of using wire of this size and the presence of the narrowpassages where the wire runs within the dispenser, and also the curvesthat need to be accomplished by the wire, cause considerable tension inthe wire during some of the relative motions accomplished by thedispenser and the core to wind and terminate.

An excessive tension on the wire causes stretching the wire too much,which worsens the quality of the finished cores. For example,considerable tension during the translation of the dispenser when itmoves parallel to the longitudinal axis of the core can arise. Also,there can be a considerable decrease in tension when the translation ofthe dispenser and the rotation of the core occur to release the wire inthe two stretches of the coil that are at the ends of the core. Thesereductions in tension cause the inconvenience of an excessive release ofwire length from the needle. The excess wire that is released becomesdeposited irregularly on the core.

U.S. Pat. No. 4,826,012 describes a wire termination solution foravoiding waste wire in a machine for winding armatures. The connectionof the wire ends of the coils occurs on the tangs of a commutator byusing moveable tubes, which surround the commutator and extract wirefrom the flyer. The flyer accomplishes circular trajectories to dispensethe wire on the armature.

SUMMARY OF THE INVENTION

An object of the present invention is that of minimizing the length ofwaste wire that needs to be cut as a result of the terminationoperations.

A further object of the present invention is that of reducing the numberof cutting operations which are necessary during the terminationoperations.

It is also an object of the present invention to improve the capacity ofpositioning termination wires along predetermined paths which anchor andplace the wires in contact with the terminal structures.

It is also an object of the present invention to accomplish wire pathsof the intermediate termination on the opposite end of the core; that ison the end of the core that requires the dispenser to extend along thecore for positioning the wire required for accomplishing the terminationpaths.

A further object of the invention is to improve the tension applied tothe wire during winding and termination. In particular, the inventionaccomplishes the constancy of the tension occurring on the wire duringwinding and renders more predetermined the tension on the wire in thetermination operations.

These and other objects of the invention are accomplished with themethod, according to independent claim 1 and the apparatus according toindependent claims 10 and 13.

Further characteristics of the invention are indicated in the dependentclaims.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will now be illustrated by the description which followsrelating to some typical embodiments with reference to the attacheddrawings.

In the drawings:

FIG. 1 is an elevation view of an apparatus for winding and terminatingwire according to the invention.

FIG. 2 is an enlarged view of portion 2 of FIG. 1 illustrating a devicefor applying tension to the wire according to the principles of theinvention;

FIG. 2a is an enlarged view of a portion of FIG. 1, as seen from thedirection 2 a illustrating a path for winding a coil of the core;

FIG. 3a is an enlarged view of the portion 3 a of FIG. 1 illustrating astage of the termination operations according to the invention. FIG. 3ais also a view as seen from directions 3 a-3 a of FIG. 3 b;

FIG. 3b is a view as seen from direction 3 b of FIG. 3 a;

FIG. 4a is a view similar to the view of FIG. 3a illustrating a furtherstage of the termination operations according to the invention;

FIG. 4b is a view as seen from directions 4 b of FIG. 4 a;

FIG. 5a is a view similar to the view of FIG. 3a illustrating a stage ofthe operations according to the invention for terminating a further coreto be wound;

FIG. 5b is a view as seen from direction 5 b of FIG. 5 a;

FIG. 5c is a view as seen from directions 5 c-5 c of FIG. 5 b;

FIG. 6a is a view similar to the view of FIG. 5a illustrating asuccessive stage with respect to the stage of FIG. 5a of the terminationoperations according to the invention;

FIG. 6b is a view as seen from directions 6 b of FIG. 6 a;

FIG. 6c is a view as seen from directions 6 c-6 c of FIG. 6 b;

FIG. 7 is a view similar to the view of FIG. 6b illustrating asuccessive stage with respect to the stage of FIG. 6a of the terminationoperations according to the invention;

FIG. 8 is a view similar to the view of FIG. 7 illustrating a successivestage with respect to the stage of FIG. 7 of the termination operationsaccording to the invention;

FIG. 9 is a view similar to the view of FIG. 8 illustrating a successivestage with respect to the stage of FIG. 8 of the termination operationsaccording to the invention;

FIG. 10 is a view similar to the view of FIG. 9 illustrating asuccessive stage with respect to the stage of FIG. 9 of the terminationoperations according to the invention;

FIG. 11a is an enlarged view of a portion of the view of FIG. 1illustrating a specific stage of the intermediate termination accordingto the invention;

FIG. 11b is a view as seen from direction 11 b of FIG. 11 a:

FIG. 12a is a view similar to the view of FIG. 11a , illustrating asuccessive stage with respect to the stage of FIG. 11a of the operationsaccording to the invention;

FIG. 12b is a view as seen from direction 12 b of FIG. 12 a.

DETAILED DESCRIPTION

With reference to FIG. 1, a core 20 is shown supported and positioned bya tubular support member 70. More particularly, core 20 is seated andsupported in a groove of member 70. As a result, the core is centred andpositioned with respect to axis 70′ of tubular member 70. Therefore,longitudinal axis 20′ of the core coincides with central axis 70′, asshown in FIG. 1.

Arms 72 are hinged in 73 like appendixes of member 70. Portions 72′ ofarms 72 are provided that press on the external surface of core 20, asshown in FIG. 1, to maintain the core seated in groove 71. Portions 72′are maintained in contact with the core by the pressing action ofpushing members 74, which push on the end portions of arms 72, as shownin FIG. 1.

Pushing members 74 are assembled on tubular member 70 to slide thereonin directions that radially depart from axis 70 in order to push on theend portions of arms 72 by means of the force of preloaded springs 75,as shown in FIG. 1.

By pushing in the opposite directions on the portions 78 of arms 72,that is against the force of the springs 75, arms 72 release thepressure action on the core and rotate to move away. This allows thecore to be moved in direction Z′ for being extracted from tubular member70.

Member 70 is connected to a ring member 76, as shown in FIG. 1. Theconnection is accomplished with bolts 78′, which press in seats of ringmember 76, as shown in FIG. 1.

Ring member 76 is supported on radial bearings 77 for the rotationaround axis 70′. The bearings are supported on a portion 93 of aplatform 94.

Ring member 76 is provided with the toothed portion 79, which is engagedby toothed belt 80. Pulley wheel 81, which is driven by motor 82, drivestoothed belt 80. Motor 82 is carried by bracket 83 which is supported byplatform 94. Programmed rotations of motor 82 rotate core 20 around axis20′ in direction RO1 and RO2 (FIG. 2a ) during winding and termination(FIGS. 11a-12b ).

A needle 21 is supported by a carrying structure 105 with respect towhich a wire W runs during winding and termination. The carryingstructure 105 is moved in directions Z and Z′ by a motor system 106 totranslate and position needle 21 in directions Z and Z′ during windingand termination.

By unscrewing bolts 78′, member 70 can be disassembled from ring member76 and substituted with another member 70 that is provided with groove71 and has different dimensions in order to seat cores of otherconfigurations.

Platform 94 is moved on guides 94′ to translate in directions X and X′by using a programmable motor (not shown).

Guides 94′ are assembled on a second platform 95, which is moved onguides 96 towards and away an observer of FIG. 1. Second platform 95accomplishes these movements by means of a programmable motor (notshown) which turns a screw 95′.

The motions of platform 94 in directions X and X′ can be used toposition core 20 during the termination operations. Similarly, themotions of second platform 95 in directions Y and Y′ can be used duringtermination and winding to position core 20, for example during windingto stratify the wire when winding the coils.

The motion of the second platform 95 in directions Y and Y′, i.e.towards and away with respect to the observer viewing FIG. 1, can beemployed for moving the finished core away from the working area of theapparatus, or to position a core to be processed in relation to theworking area of the apparatus. During this movement in directions Y andY′, portions 78 of arms 72 can come in contact with a cam surface, whichis appositely profiled to move arms 72 away from the core in order tofree the core so that it can be unloaded and substituted with a core tobe processed.

A deflector 85 is assembled on a radial arm 86 in order to extendparallel to axis 20′, as shown in FIG. 1. Radial arm 86 is assembled onthe end of first support member 87 by means of a bolt 86′. First supportmember 87 is assembled in a groove 88′ of a second support member 88.The groove has a diameter extension with respect to axis 70′.Consequently, First support member 87 accommodates in a portion ofsupport member 70 of core 20 as shown in FIG. 1.

First support member 87 is provided with an inclined groove 87′ where acursor 89 slides in a guided manner. Cursor 89 is fixed to the end of ashaft 90 by means of a bolt 89′. This is possible because shaft 90 isinserted in a bore of second support member 88; the bore is incommunication with groove 87′, as shown in FIG. 1.

By moving shaft 90 in direction Z, cursor 89 moves in inclined groove87′ to push support member 87 in a direction R2, as it is allowed by theguiding function of groove 88′.

Therefore, deflector 85 is moved in direction R2 towards the centre ofcore 20 and along a radius with respect to axis 20′ (see also FIGS.11a-12b ).

By moving shaft 90 in direction Z′, cursor 89 moves in the inclinedgroove in an opposite direction to push support member 87 in radialdirection R1, as it is allowed by the guiding function of groove 88′.Therefore, deflector 85 is moved in direction R1, i.e. towards theoutside of core 20 and along a radius with respect to axis 20′.

Second support member 88 is provided with a tubular part 88″, whichextends coaxial to axis 20′ as shown in FIG. 1. Shaft 90 extendscoaxially inside tubular part 88″ as shown in FIG. 1. Tubular part 88″is moved in directions Z and Z′ by a screw sleeve system 91, which ismoved by a programmable motor (not shown). In this manner, deflector 85is moved according to programmable positions in directions Z and Z′ tobe aligned with slots like 120 of an end D of the core 20 (FIGS. 11a-12b).

Shaft 90 is moved in directions Z and Z′ by an actuator (not shown) toposition deflector 85 in predetermined positions of directions R1 andR2.

The solution for applying tension to wire W, indicated also as 100, isshown more in detail in FIG. 2. The wire W is wound around pulley wheel30 for at least one turn. The idle wheel 31 presses on the wire becauseit is pushed by actuator 32, which is set with a predetermined force.

Pulley wheel 30 is driven by a controlled motor 33. Motor 33 is able toproduce predetermined torques on pulley wheel 30 in two rotationdirections RP1 and RP2 by following a program. The torques in directionRP2 are opposite to the direction of the wire running towards needle 21.These torques are transformed into a tension T1 on wire W.

Tension T1 tends to drag the wire, therefore it creates a tension onwire W when the latter exits the needle, or the tension T1 is able todraw wire W from the needle when the tension of wire W becomes zero.

The torques in the rotation direction RP1 will be in the same directionas the running of the wire towards needle 21. These torques cause apushing action T2 on the wire W. Pushing action T2 tends to feed thewire W out of the needle, or it reduces the drag existing on wire W.

Pulley wheel 34 pushes the wire in a direction G due to thepredetermined pushing force caused by piston 35. In this way anadditional trajectory is generated for the wire when predeterminedlengths of wire W are withdrawn by pulley 30 due to rotation indirection RP2. In this situation, the wire upstream of pulley 34 isblocked by brake device 35′. To block the wire, the brake device 35presses on the wire by means of a part 36, which pushes the wire againsta member 37. Part 36 is moved for pressing on the wire, and therefore toblock it when a cam 38′, on which a wheel 38 runs, moves in direction G.

In particular, wheel 38 is integral to part 36, while the cam isintegral to the shaft of piston 35, which moves pulley wheel 34. The campresents a profile, which causes wheel 38 to move as a function of theposition of pulley 34 in its movements in directions G and G′.

Therefore, when pulley 34 moves in direction G to create the additionaltrajectory, cam 38′ moves wheel 38 in direction Z′ to cause the wire tobe blocked by part 36, and thereby causes that no further wire is fed bythe wire source which is upstream of the brake device 35′. In this way,the length of wire withdrawn by pulley 30 occupies a predeterminedadditional trajectory, which extends between the brake device 35 andpulley wheel 30. When there is a decrease in tension during thetrajectories accomplished by the needle and consequently excessiverelease of the wire length, the additional trajectory created by pulleywheel 34 causes a withdrawal of excessive length of wire and is able tostabilize the tension of wire W.

Winding of a coil around a pole 20″ of the core requires that the wireexit accomplishes a trajectory TR with respect to the pole of the coreas shown in FIG. 2a . The trajectory TR is accomplished for winding aturn of the coil and needs to be repeated as many times as is the numberof turns of the coil.

The trajectory TR consists of a translation TR1 in direction Z of theneedle 21 when moved by motor system 106. Stretch AR1 follows andconsists of a combination of rotations of the core in direction R01,driven by motor 82, and translations of the needle in directions Z andZ′. Afterwards translation TR2 of the needle 21 in direction Z′ occursdriven by system 106. Lastly stretch AR2 occurs, consisting of acombination of rotations of core 20 in direction R02, driven by motor82, and translations of the needle in directions Z and Z′.

During a trajectory like TR the tension on the wire increases duringtranslations TR1 and TR2, therefore in the solution 100 for applyingtension to the wire W torques are applied to pulley wheel 30 indirection RP1, which is in the same direction as the running directionof the wire W towards the needle. The tension is applied as a functionof the position of the needle during translations TR1 and TR2. This willproduce a pushing action T2 on the wire, which tends to feed the wireout of the needle, or reduces the tension existing during thetranslations TR1 and TR2.

In stretches AR1 and AR2 the tension of the wire decreases becausemovement on the first part of these trajectories can produce anexcessive length of wire—see length of wire W1 that needs to be woundagainst the shorter part of the pole 20″. Consequently, torques will beapplied to pulley wheel 30 in direction RP2, which is opposite to thedirection in which wire is running towards the needle. The tension isapplied as a function of the position of the needle during rotation ofthe core. This will produce a tension T1 on the wire W, which tends torecover a predetermined length of wire from the needle, or increases thetension existing on the wire along stretches AR1 and AR2.

A sequence of operations for connecting a final wire W1 of a wound coreto a tang 22 and for accomplishing the initial connection to a tang of acore 20 to be wound are shown starting from FIG. 3 a.

During the sequence of operations, movement occurs of wire gripper 26(see also FIG. 1), needle 21 and core 20 together with tang 22. Wiregripper 26 is moved in an electronically controlled way to obtainpredetermined displacements in directions Z and Z′, X and X′, Y and Y′using respectively screw/sleeves mechanisms 102, 103, and 104.

Each of these screw/sleeve mechanisms is moved by a respectivecontrolled motor (not shown), which follows a program. The core 20together with the tang 22 are moved by a translating platform 94 indirections X and X′, and by a translating platform 95 in directions Yand Y′ (directions perpendicular to the view of FIG. 1, where thedirection Y enters into the page of FIG. 1, whilst the direction Y′exits from the page of FIG. 1). Each platform 94 and 95 is moved by arespective controlled motor (not shown) which follows a program.

During the relative motions of wire gripper 26 and tang 22 with respectto needle 21 there are stages where the lengths of wire are fed from theneedle 21 by means of pulley wheel 30 to reduce tension, whilst in otherstages lengths of wire will be withdrawn from the needle by pulley wheel30.

FIGS. 3a and 3b show needle 21 oriented parallel to axis 20′ of core 20,and after needle 21 has been displaced from the dashed line position Ato position B (in direction Z) to place a stretch W1 of wire W in seat22′ of final tang 22 of a wound core. During the inverse movement of theneedle from the dashed line position B to position A (see also FIG. 4a), tension T1 is applied to the pulley wheel 30 to retrieve apredetermined length of wire from the needle, therefore for guaranteeingthat outside the needle the wire does not loosen excessively.

In position B (see FIG. 3b ), the needle 21 has been positioned in seat23′ of portion 23 of the wire gripper using the vertical movement indirection Z of the needle and then a movement of portion 23 of the wiregripper 26 in direction Y′. During the movement in direction Z the wirepasses through aperture 24′. These movements have resulted in thestretch of wire W2 being under side S1 of the holding part of the wiregripper 26, as shown in FIGS. 3a and 3b . Successively, by using avertical movement of the needle in direction Z′, the needle can returnto position A outside the wire gripper, as shown in FIG. 4 a.

FIGS. 4a and 4b show that part 24 of the wire gripper has beentranslated in direction Y for grasping the stretch of wire W3 withinseat 23′. Furthermore, prior to the situation of FIGS. 4a and 4b alsocutting blade 25 has been moved in direction Y to cut stretch W3 to arequired length against side S1.

Then, and also shown in FIGS. 4a and 4b , the wire holding portion 23can move in direction X to push with its external structure theremaining cut stretch W2 against base portion 22″ of tang 22.

The position occupied by stretch W2 against the base part 22″ of thetang 22 is such that the structural part 22′″ is clear of the wire andcan be the part where the electrode contacts during fusing operations todeform and heat the tang and wire, like has been described in EuropeanPatent 419,849.

Consequently after the operations of FIGS. 4a and 4b , the core isfinished and terminated as regards final tang 22, and the wire gripper26 remains holding end W3 that extends to needle 21 by means of stretchW. The stretch of wire extending beyond the wire gripper 26 on theopposite side with respect to needle 21 has been cut by blade 25 at apredetermined distance from side S1 of the wire gripper withoutproducing wire waste.

In FIGS. 5a, 5b and 5c , the wire gripper 26 holds the stretch of wireW4 which extends to needle 21 in preparation for connection to theinitial tang 22 of a core to be wound and has moved in direction X tobring the holding portion in position C near to the entrance on one sideof seat 22′ of initial tang 22.

In the sequences of FIGS. 6a, 6b and 6c , which follow those of FIGS.5a, 5b and 5c , the needle has moved in the vertical direction Z toposition a portion of stretch W4 in seat 22′ of initial tang 22. Thewire enters seat 22′ through the entrance of seat 22′ on side ofposition C where the wire gripper 26 is positioned (see in particularFIGS. 6b and 6c ). When the needle translates in direction Z asmentioned, pulley wheel 30 applies a tension T1 to withdraw a certainlength of wire, which goes and occupies the additional trajectorycreated by pulley wheel 34 and wire brake device 35.

In FIG. 7, wire gripper 26 and core 20 have been moved with respect toneedle 21 with movements in direction X that are synchronized forstarting to wind a portion of stretch W4 around tang 22, as shown. Toaccomplish these movements, platform 94 has been moved in direction Xfor a movement that is synchronized with the motion of the screw/sleevemechanism 103 which moves the wire gripper 26 in direction X.

In FIG. 8, the wire gripper 26 and the core 20 have been moved withrespect to needle 21 in direction Y′ with further synchronized movementsto continue to wind a further portion of stretch W4 around tang 22, asshown. To accomplish these movements, platform 95 has been moved indirection Y′ for a movement that is synchronized with the motion of thescrew/sleeve mechanism 104, which moves the wire gripper 26 in directionY′.

In FIG. 9, the wire gripper 26 and the core 20 have been moved withrespect to needle 21 in directions X′ and Y′ with further synchronizedmovements to complete winding a portion of the stretch W4 around tang22, as shown.

In FIG. 10, wire gripper 26 has moved in direction Y′ and during thismovement has released the hold on the final portion W3 in front of base22″ of tang 22 to push and therefore direct W3 in front of base 22″ oftang 22. Furthermore, in FIG. 10 the final portion W3 has come out ofthe holding portion of gripper 26.

Still with reference to FIG. 10, the needle 21 has been oriented back toa perpendicular position according to the orientation for winding. Atthis point the needle 21 can start winding a coil that will have aninitial wire anchored to tang 22 like is shown in FIG. 10.

The synchronized movements accomplished by wire gripper 26 and tang 22in the stages of FIGS. 5a -10 have occurred by means of synchronizedtranslations that are parallel to a plane perpendicular to axis 20′ ofcore 20, and wire W has been fed in a direction that is perpendicularwith respect to the plane in order to reach the exit of needle 21. Thesynchronized movements of the wire gripper 26 and of tang 22 occur forpredetermined displacements of a controller program to guaranteepositioning of stretch W4 with respect to tang 22 with extreme accuracyand with limited room.

During the synchronized movements of the wire gripper 26 and tang 22,the pulley wheel 30 undergoes application of predetermined torques indirections RP1 and RP2 which are synchronized with the movements of thewire gripper 26 and the tang 22.

The sequence of operations illustrated with reference to FIGS. 3a -10have achieved the connection of final wire to a tang of a wound core andthe connection of an initial wire to the tang of a core to be wound.These operations have occurred without producing stretches of waste wireand also by positioning the end of wire W3 adjacent to base 22″ of tang22 and along a definite termination path. Furthermore additional cuttinghas not been required after the cutting performed at the requiredmeasurement to terminate the wound core as shown in FIGS. 3a -4 b.

With reference to FIGS. 11a-11b , the needle 21 has finished windingpole 20″ and wire W needs to be positioned in groove 120 of core 20.Groove 120 extends for a circular stretch around axis 20′ adjacent tothe end of core 20. Normally wire W is disposed in a portion of groovewhich leads to a pole where a coil needs to be wound. As shown in FIGS.1, 11 a and 12 a, the end of core D where the groove is positioned isopposite to end where the needle initially reaches the core beforecrossing it to wind the coils.

In the situation of FIGS. 11a and 11b , the needle 21 is stationary withthe wire extending from a finished coil. Deflector 85 is in a radialinternal position ready to move in direction R1 and in direction Z′ tooccupy a predetermined position with respect to groove 120.

With reference to FIGS. 12 a and 12 b, the core has been rotated aroundaxis 20′ and deflector 85 has been moved in direction R1 to interceptthe wire W and bring it in a more external position. In the externalposition of deflector 85, a stretch of the extension of wire W isaligned with groove 120, as shown in FIG. 12a . Continuing with apredetermined rotation of the core around axis 20′, wire W is wound ingroove 120 by running on deflector 85 and exiting needle 21. In thismanner it is possible to reach an angular position of the core aroundaxis 20′ where the wire can exit groove 120 and pass through passage110. By passing through passage 110, the wire can return towards thecentre of the core where it reaches a next pole to be wound. To achievethis path, deflector 85 is moved in direction Z and direction R2 to freethe wire and avoid collision with core end D. The wire that has beenreleased in this sequence is withdrawn by pulley wheel 30 of the deviceto create tension so that the wire is pulled though passage 110 andmaintained tensioned within needle 21.

In other embodiments of the invention the core can be provided withexternal slots, consequently the needle, instead of passing through thecore as shown in FIG. 1, will move along the outside of the core toreach end D where groove 120 is located.

In the sequence of operations of FIGS. 3a -10, for certain terminationpaths the translations of the tang 22 can be substituted with rotationsof the tang 22 around axis 20′ (achieved by rotating the core aroundaxis 20′). Therefore in certain cases it can be foreseen to rotate tang22 and to move gripper 26 in a synchronized manner to obtain connectionof the wire to tang 22.

The foregoing description of a specific embodiment will so fully revealthe invention according to the conceptual point of view, so that others,by applying current knowledge, will be able to modify and/or adapt forvarious applications such an embodiment without further research andwithout parting from the invention, and it is therefore to be understoodthat such adaptations and modifications will have to be considered asequivalent to the specific embodiment. The means and the materials torealise the different functions described herein could have a differentnature without, for this reason, departing from the field of theinvention. It is to be understood that the phraseology or terminologyemployed herein is for the purpose of description and not of limitation.

1-15. (canceled)
 16. A method for winding and terminating coils woundwith at least one electric wire one a core of a dynamo electric machine,the core having a longitudinal axis and being supported by a tubularsupport, the method comprising: winding a wire over a pulley wheel;feeding the wire into a wire dispenser having a tubular portion forpassage of the wire and an exit from where the wire reaches the core;dispensing the wire from the wire dispenser; translating the dispenserwith respect to the core during winding or the termination of leads;rotating the tubular support around a rotation axis; recovering aportion of the wire returning from the pulley; and applying torque intwo directions on the pulley wheel as a function of the position of thedispenser in the translation and the position of the core in therotation.
 17. The method according to claim 16 wherein the torque isapplied in the feeding direction of the wire towards the dispenser inthe translation stage of the dispenser to wind the core.
 18. The methodaccording to claim 16 wherein the torque is applied in a directionopposite to the director for feeding the wire towards the dispenserduring the rotation stage for winding the core.